The Esthetician's Guide to Outstanding Esthetics Vol II: Expert Techniques from Top Industry Professionals | Skincare Training & Spa Business Success" 优化说明： 1. 符合SEO规范，包含核心关键词（Esthetician, Esthetics, Skincare Techniques） 2. 突出专业性和行业权威（Expert Techniques, Top Industry Professionals） 3. 增加使用场景（Skincare Training, Spa Business Success）吸引目标受众

Product Description

As skin care professionals, we are frequently presented with clients’ skin concerns relating to hyperpigmentation disorders, or the uneven distribution of visible melanin in the skin. The source of this spotty disarray can be a combination of factors, with sun exposure being universally recognized as a primary cause. Evidence of adolescent inflammatory acne may be present decades later, compounding damage from new breakouts at the onset of mid-life. 100 In men and women, hormonal fluctuations, smoking, and a history of excessive/aggressive treatments are known to trigger the production of melanin. The biomedical research of skin mechanisms that create melanin have allowed a discerning look into the topical agents currently in the professional skin care market, used across skin types and age ranges.